In the Swordsman scenario of Samurai Warriors: Katana, Kojirō initially confuses the protagonist for Musashi during a pirate raid at Ganryūjima. His recruitment mission in Survival Mode is an open call for a sword instructor, an opportunity he will take if the objectives are completed successfully. When he's defeated, he dubs his rival as the land's greatest warrior with his dying breath. If he is impressed during Musashi's dream mode, he will appear as the stage's last challenger.
He is killed in their duel at Ganryujima. In Musashi's story mode, he acts as his rival's foil and taunts him at any given opportunity. He also appears in various other scenarios, mostly limited to dream stages. During Ginchiyo's story mode, he reinforces Yoshihiro and traps Sakon at Shōryuji. He is one of the generals who guards their escape point.
In Samurai Warriors 2, Kojirō appears as reinforcements for the Eastern army at the Battle of Kuzegawa. ~~ Meng Huo Warriors Orochi 3 Samurai Warriors